Electric-light fixture.



F. E. DHUIVY.

ELECTRIC LIGHT FIXTURE.

APPLICATION FILED FEB.

Pafented Dec. 30,1919.

2 SHEETS-SHEET l F. E. D'IIUIVIY.

ELECTRIC LIGHT FIXTURE. ,I

APPLICATION FILED FEB. 24. Isls.

Patent-ed Dee. 30, 1919.

2 SHEETS-SHEET 2.

FERNAND E. DHUMY, 0F ENGLEWOOD, NEW JERSEY,

ELECTRIC-LIGHT FIXTURE.

To all whom t may concern.'

Be it known that I, FERNAND E. DHUMY,

' a citizen of the United States, and resident of Englewood,county of Bergen, and State of New Jersey, have invented certain new and useful Improvements in Electric-Light Fixtures, of which the following is a specification.

This invention relates to lighting fixtures and particularly to electric Alighting fixtures designed tochange the component rays of an electric'lamp into the same relative proportions of rays of various color values as found in daylight.

The light emitted by the'ordinary electric lamp does not contain the seven colors of the spectrum in the same proportions as the rays of theV sun or day light, but ycontains a prepjonderance of yellow, orange and red rays.

arious methods have been proposed for eliminating these excess rays but none have been satisfactory, owing to the fact that 'the color value of the light emitted thereby Cannot be varied to conform to changes in the spectrum values of daylight under varying conditions. The spectrum values of daylight vary with the time of day, the season of the year, with the locality, and with the condition of the weather. Furthermore, the light from an electric'lamp is affected by other nearby sources of light, by the decorativescheme of the adjacent premises, and by yariations in current voltage and the condition of the lamp filament. It is the object of the present invention to provide a light* ing xture designed to permit .the relative proportions of the component rays of the .spectrum to be varied at will so that the light emitted may be caused to simulate daylight under the varying conditions above set forth.

ln the drawings, Figure l is a vertical sectional view of a lighting fixture embodying the invention; i

Fig. 2 a fragmentary horizontal section on the line H-H of Fig. l; y

Fig. 3 a bottom view, partly in horizontal section; and

'Fig 4 an enlarged vertical sectional view on'the line IV-IV of Fig. 1.

Referring to the various parts by Jammerals, l designates an incandescent electric lamp of ordinary construction supported in a suitable socket in thelamp casing. The lamp casing comprises a parabolica-l refiecting portion 2 and an enlarged rectangular specification of Letters Patent.

Patented Dee. 3o, 191e.

Application tiled February 24, 1919. Serial No. 278,979. v

portion 3 preferably formed integrally with the reiector 2 and formed with an inwardly extending liange 4 at its outer edge supporting a diffusing or mixing lens 5. The lens or ray-mixing plate 5 is preferably formed of'a sheet of plain white glass having its outer surface covered with small prisms 5a, but any other suitable or known form of diffusing or refracting device may be employed. v

A pair of bars or ledges 6 are fixed to 0pposite sides/of the rectangular portion 3 ofthe 'lamp casing, in which are journaled the pivot pins-.Tand 8 of the end supports 9 and 10 of two series of colored glass plates 11 and l2. A rock arm 13 is formed on each of the plate supports 9 at one side of the lamp casing adjacent the pivot pin of said support, and each support 10 at the same side of the 'casing is formed with a rock arm 14 adjacent its pivot pin. All ofthe arms 13 vare pivotally connected at their outer ends to a bar or rod 15 extending along the inner sides of said arms and through an aperture '16 in the casing, and all of the arms 14 are pivotally connected at their outer ends to a bar or rod 17 extending along the outer sides of sald arms and out through the aperture 16. The outer end of bar 17 is pivotally connected to a handle or lever 18 fixed on a shaft 19 journaled in supports 20 formed on a bracket 21 held to one side of the portion 3 of the casing adjacent aperture 16. A pinion 22 fixed on shaft 19 meshes with a pinion 23 fixed on a shaft 24 journaled in supports 20. A rock arm 25 xed on shaft 24; is pivotally connected at its outer end with the outer end of bar 15. By yrocking handle 18 the glass plates l1 and 12 may be simultaneously swung in opposite directions. Suitable friction washers 26 and 27 are provided for frictionally holding the parts in adjusted po\ sition. K

The glass plates are properly colored and treated to give them the desired light-ray absorbing or screening quality, all of the plates of both series being the same color. It will be obvious that while l have shown one ray-absorbing screen, any desired number of screens may be mounted in the casing one above the other, the glass plates or shiftable sections of the dierent screens being of different colors. rlhe `glass sections of the screen may be simultaneously shifted by manipulating the handle 18 so as to form one continuous screen through which all the lll@ rays from the* lamp pass before reaching the diffusing lens, or the plates may be adjusted to yertical positions to permit the rays to passgtosfthe diffusing, lens Without passing through the colored glass plates; or said plates may be adjusted to any intermediate position sc that a part of the lightlux will .pass through the plates and apart between the plates. It will thus be seen that any desired proportion of the excess rays may be filtered out and that the fixture is readily adjustable to vary the proportion of the -rays filtered out. c

, An important feature of the invention resides in the arrangement of the screening plates in two series and the means for shifting the plates of the two series in opposite directions.v This arrangement avoids the lateral deflection of the major portion of the rays in one direction when the plates are in partly openvposition, which would resultif a screen were employed made up of sections opening in the same direction. rll`he deflection of rays in opposite directions secured by this arrangement. also tends to mixthe screened light with the unscreened,

light passing between the partly openedY sections of the screen, thus avoiding the formation of zones of light in the field of illumination having different spectrum values.

' rlhe ray mixing plate or lens 5' having its outer surface covered with small 'prismatic projections serves to completely-mix the Ascreened and unscreened rays, as the multiplicity of small prisms will bend the light rays 'in all directions as they pass through A the plate. A highly dilfused. light flux hav-` ing a uniform spectrum throughout its field is thus obtained. What I claim is:

12A lighting fixture comprising a source of light, a reflector for projecting the light rays, a sectional translucent ray-,filtering de- 'v1ce supported in the path of the rays pro- `jected by the reflector, and meansfor shifting the sections of said device relatively to Seach other to adapt the .'deviceto filter any desired proportion of the light rays .proj ected by said reflector.

. 2. A lighting fixture comprisinghasource of light, a reflector for projecting the light to-intercept various proportions of rays, a diffusing lens, a plurality of colored glass plates interposed between the reflector and lens, and means for shitting said plates relatively to each other to adapt the plates the rays -paing from the reflector tol the vdiusing ens.

3. A lighting fixture comprising a casing having a reflecting surface therein, a source of light in said casing, a diffusing lens mounted in the casing, a series of colored glass plates extending across the casing between the reflector and rlens and adapted when in the same plane to intercept all the rays projected. by the reflector, means for pivotally supporting said plates at their ends, and 'means for swinging said plates about their pivots to permit rays of light to pass between adjacentplates.

. 4.. An illuminating device comprising a source ofl light, a reflector for projecting the rays emitted by the source of light, a series of colored translucent plates pivotally' source Voit' light, a reflector for lprojecting the. rays emitted by the source. of light, a series of colored translucent plates pivotally supported in the path of the projected y rays, means whereby certain of said plates may be rocked in one direction` and the other plates rocked in the'opposite direction about their pivots, and a refracting device supported at the opposite side of said plates from the source of light. f

6. An illuminating device comprising a source of light, a reflector for projecting the light rays, a glass refracting plate having a surface formed with a` multiplicity of small prisms, a plurality of colored'glass platesinterposed between the reflector and the rerac'ting plateand means for shifting said plates-"relatively to each other to adapt the plates to intercept various proportions of the rays passing from the reflector to the refracting plate. v

7. An illuminating device comprising a source of light, a reflector for projecting the light rays, two series of colored glass plates, means for pivotally supporting said plates individually at spaced points in the same plane in the path'of the projected rays, and means for simultaneously rocking the two series of plates in opposite directions about their pivots to and from positions in the same plane.

8. An illuminatingfdevice -comprising a source of light, a reflector for projecting the light rays, two series of colored glass plates, means for pivotally supporting said plates `individually at spaced pointsv in the same proportion of the light ux,' and means for mixing the modified and unmodified portions of the light flux.

l0. The combination of a source of light,v

colored translucent means adjustable to filter various proportions of the light flux, and means for mixing the rays composing the filtered and uniltered portions of the Hux.

y 11. The combination of a source of light,

' a ray-mixing lens having an irregular surface, a ray-iiltering device interposed between the source of light and said lens having a plurality of'pivoted colored translucent sections, means for rocking said 15 for maintaining said sections in their ad- 20 justed positions.

In testimony whereof I hereunto aiX my signature.

FERNAND E. DHUMY.. 

